8b81ef589a
Right now there is a transport module structure which provides per-transport type functions and data and a transport structure which contains per-instance public data as well as function pointers to instance specific functions. This patch moves public transport visible instance data to the client structure (which in some cases had duplicate data) and consolidates the functions into the transport module structure. Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
175 lines
3.8 KiB
C
175 lines
3.8 KiB
C
/*
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* net/9p/9p.c
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*
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* 9P entry point
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*
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* Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
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* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to:
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* Free Software Foundation
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02111-1301 USA
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*
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <net/9p/9p.h>
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#include <linux/fs.h>
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#include <linux/parser.h>
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#include <net/9p/client.h>
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#include <net/9p/transport.h>
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#ifdef CONFIG_NET_9P_DEBUG
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unsigned int p9_debug_level = 0; /* feature-rific global debug level */
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EXPORT_SYMBOL(p9_debug_level);
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module_param_named(debug, p9_debug_level, uint, 0);
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MODULE_PARM_DESC(debug, "9P debugging level");
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#endif
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/*
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* Dynamic Transport Registration Routines
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*
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*/
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static DEFINE_SPINLOCK(v9fs_trans_lock);
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static LIST_HEAD(v9fs_trans_list);
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/**
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* v9fs_register_trans - register a new transport with 9p
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* @m: structure describing the transport module and entry points
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*
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*/
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void v9fs_register_trans(struct p9_trans_module *m)
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{
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spin_lock(&v9fs_trans_lock);
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list_add_tail(&m->list, &v9fs_trans_list);
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spin_unlock(&v9fs_trans_lock);
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}
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EXPORT_SYMBOL(v9fs_register_trans);
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/**
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* v9fs_unregister_trans - unregister a 9p transport
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* @m: the transport to remove
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*
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*/
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void v9fs_unregister_trans(struct p9_trans_module *m)
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{
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spin_lock(&v9fs_trans_lock);
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list_del_init(&m->list);
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spin_unlock(&v9fs_trans_lock);
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}
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EXPORT_SYMBOL(v9fs_unregister_trans);
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/**
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* v9fs_get_trans_by_name - get transport with the matching name
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* @name: string identifying transport
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*
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*/
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struct p9_trans_module *v9fs_get_trans_by_name(const substring_t *name)
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{
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struct p9_trans_module *t, *found = NULL;
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spin_lock(&v9fs_trans_lock);
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list_for_each_entry(t, &v9fs_trans_list, list)
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if (strncmp(t->name, name->from, name->to-name->from) == 0 &&
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try_module_get(t->owner)) {
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found = t;
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break;
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}
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spin_unlock(&v9fs_trans_lock);
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return found;
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}
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EXPORT_SYMBOL(v9fs_get_trans_by_name);
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/**
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* v9fs_get_default_trans - get the default transport
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*
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*/
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struct p9_trans_module *v9fs_get_default_trans(void)
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{
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struct p9_trans_module *t, *found = NULL;
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spin_lock(&v9fs_trans_lock);
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list_for_each_entry(t, &v9fs_trans_list, list)
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if (t->def && try_module_get(t->owner)) {
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found = t;
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break;
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}
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if (!found)
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list_for_each_entry(t, &v9fs_trans_list, list)
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if (try_module_get(t->owner)) {
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found = t;
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break;
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}
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spin_unlock(&v9fs_trans_lock);
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return found;
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}
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EXPORT_SYMBOL(v9fs_get_default_trans);
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/**
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* v9fs_put_trans - put trans
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* @m: transport to put
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*
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*/
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void v9fs_put_trans(struct p9_trans_module *m)
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{
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if (m)
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module_put(m->owner);
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}
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/**
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* v9fs_init - Initialize module
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*
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*/
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static int __init init_p9(void)
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{
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int ret = 0;
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p9_error_init();
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printk(KERN_INFO "Installing 9P2000 support\n");
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p9_trans_fd_init();
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return ret;
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}
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/**
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* v9fs_init - shutdown module
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*
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*/
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static void __exit exit_p9(void)
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{
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printk(KERN_INFO "Unloading 9P2000 support\n");
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p9_trans_fd_exit();
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}
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module_init(init_p9)
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module_exit(exit_p9)
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MODULE_AUTHOR("Latchesar Ionkov <lucho@ionkov.net>");
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MODULE_AUTHOR("Eric Van Hensbergen <ericvh@gmail.com>");
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MODULE_AUTHOR("Ron Minnich <rminnich@lanl.gov>");
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MODULE_LICENSE("GPL");
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